Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 68, Issue 8, Pages 6917-6926Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2020.3000116
Keywords
Topology; Couplings; Network topology; Impedance; Magnetic flux; Magnetic resonance; Switches; Compensation topology; inductive power transfer (IPT); position tolerance; X-Type
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Funding
- U.S. Department of Energy [DE-EE0008450]
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The article introduces a primary-side X-type compensation topology for inductive power transfer systems to achieve stable power transfer against various magnetic coupling variations without the need for strict control and coil design. The X-type compensation provides stable output characteristics and enhanced tolerance to position shifts, suitable for low power IPT systems with high mobility demands.
The output characteristic of an inductive power transfer (IPT) system is highly susceptible to variations in magnetic coupling. In this article, a primary-side X-type compensation topology is proposed to acquire stable output characteristics against a wide range of magnetic coupling without resorting to tight control and coil design. By introducing the concept and derivation principle for the coupling-insensitive compensation topologies, the X-type network is presented to provide self-regulation ability for primary coil current against variable coupling, thereby enabling steady power transfer in a highly dynamic environment. The design considerations for the passive parameters are elaborated, followed by the comparison with regular compensation methods. Owing to its unique structure and design flexibility, the X-type compensation exhibits a stable output characteristic that is beneficial in enhancing the tolerance to position shifts. Moreover, it also features a wide soft-switching range and more flexible design for the output level range than previous topologies. Experimental results show stable power transfer over a coupling factor of 0.14-0.28, where the power fluctuation is less than 20%. The presented method is seen as a potential solution for low power IPT systems, where high mobility is demanded.
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